Safety device for elevators.



H. NOTTHOFP. SAFETY DEVICE FOR ELEVATORS. APPLICATION FILED DEC. 28, 1912.

1 71 79 Patented Aug. 26, 1913.

K W F Attorneys m PLANOGRAPH COJVASHINGTON, D, cv

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HENRY NOT'IHOFF, OF LOS ANGELES, CALIFORNIA.

SAFETY DEVICE FOR ELEVATORS.

Specification of Letters Patent.

Patented An 26,1913.

Original application filed August 20, 1912, Serial No. 716,096. Divided and this application filed December To all whom it may concern:

Be it known that I, HENRY Nor'rnorr, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Safety Device for Elevators, of which the following is a specification.

The present invention relates to improvements in safety devices for elevators, the presentapplication being a division of the application filed August 20, 1912, Serial No. 716,096, and in which the primary object of the invention is to provide a means for controlling the movements of the car within the elevator shaft, so that the usual mechanism may be rendered inoperative, the present means being a spring actuated means in which both the pilot valve and main valve of the operating mechanism are brought to a neutral position and the car consequently stopped.

with the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter de scribed and claimed, it being understood that changes in the precise embodiment of invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawings :Figure 1 is a side elevation illustrating the shaft and elevator with the present invention diagraimnatically applied. Fig. 2 is a side elevation in the direction of the arrow, Fig. 1, of the mechanism for placing the auxiliary and main valves in neutral position.

Referring to the drawings, the numeral 1 designates the elevator shaft, and 2 the car which is operated as usual, and is controlled through the control lever 3. The cables 4- and 5 and their sheave 6, through the lever constitute the means whereby the car is controlled in its movements up and down the shaft.

The present device is constructed to stop the oscillation of or return the sheave or drum 6 to normal stopped position should the Serial No. 739,145.

cables leave the sheaves 6 and thus conse quently render the manually operated controlling mechanism of the car inoperative.

The auxiliary valve chamber 7, and the main valve chamber 8 are mounted in the usual manner, the valve rod 9 of the auxiliary valve being connected to one end of the rocking arm or lever 11, while the valve rod 12 of the main valve is operably connected to the opposite end of the lever 11. Connected to the lever 11 is a rod 14-, whose lower end is connected to the crank arm 15 keyed upon the outer end of the shaft 16, and thus movable with the sheave 6 of the elevator mechanism.

An arm 17 is connected to the disk or crank arm 15 and extends downwardly and is normally held in a vertical position by means of the two springs 1S-18 whose inner terminals are connected to the strap 19 connected to and carried by the lower end of the arm 17 while the outer terminals are mounted in the rigid supports 20. These springs are so adjusted, that their tension is equal and therefore the arm 17 is maintained normally in the position as shown in Fig. 1. It will thus be seen from the foregoing description that the construction under normal running conditions with the cables 4; and 5 properly around the sheave or drum 6, and the car running, that the re s-pective main and auxiliary valve rods 9 and 12 will be operated as usual, and consequently either one of the springs 18 or 18 will be placed under tension as the arm 17 moves to one side; but whenthe cables 4 and 5 leave the sheave 6 the two springs 18-18 will return the arm 17 to a perpendicular or vertical position as shown in F 1 and consequently place both valve rods in neutral position so as to immediately turn the sheave to normal position and consequently stop the car.

What is claimed is A safety device for elevators, including an oscillatory sheave, a cable for manually operating it, an arm connected to the sheave, and two springs, the inner ends of which are connected to the free end of the arm,

said springs extending in opposite directions as my own, I have hereto afiixed my signaand having thelr outer ends fast, whereby ture 1n the presence of tWo wltnesses.

should the cable leave the sheave, the springs HENRY NOTTHO'FF. Will return and maintain the arm and sheave Witnesses: 5 in neutral position. SAMUEL Gr. BROW In testimony that I claim the foregoing J on M. TAYLOR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, 1 0.? 

